diff --git a/Library/Homebrew/cmd/doctor.rb b/Library/Homebrew/cmd/doctor.rb
index 26d6cb9adf48e5f47eb40399879d3df15c5fe99f..2276f1c4a81feb17ab12d888a3039f61d2bfc9bb 100644
--- a/Library/Homebrew/cmd/doctor.rb
+++ b/Library/Homebrew/cmd/doctor.rb
@@ -869,7 +869,7 @@ end
 def check_missing_deps
   return unless HOMEBREW_CELLAR.exist?
   s = Set.new
-  Homebrew.missing_deps(Formula.installed).each do |_, deps|
+  Homebrew.missing_deps(Formula.installed).each_value do |deps|
     s.merge deps
   end